FPSCR_FEX
~(FPSCR_FEX | FPSCR_VX);
(FPSCR_FEX | FPSCR_VX);
fsr = fe->fe_fpscr & ~(FPSCR_FEX|FPSCR_VX);
fsr |= FPSCR_FEX;
if (fsr & FPSCR_FEX)